package com.settlement.system.aspect;

import cn.hutool.core.util.StrUtil;
import com.settlement.system.common.annotation.AppPreventDuplicateSubmit;
import com.settlement.system.common.exception.AppBusinessException;
import com.settlement.system.common.exception.BusinessException;
import com.settlement.system.common.result.ResultCode;
import com.settlement.system.common.util.RequestUtils;
import jakarta.servlet.http.HttpServletRequest;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import java.util.concurrent.TimeUnit;

/**
 * 处理重复提交的切面
 *
 * @author haoxr
 * @since 2023/05/09
 */
@Aspect
@Component
@Slf4j
@RequiredArgsConstructor
public class AppDuplicateSubmitAspect {

    private final RedissonClient redissonClient;

    private static final String RESUBMIT_APP_LOCK_PREFIX = "APP:LOCK:RESUBMIT:";

    /**
     * 防重复提交切点
     */
    @Pointcut("@annotation(preventAppDuplicateSubmit)")
    public void preventAppDuplicateSubmitPointCut(AppPreventDuplicateSubmit preventAppDuplicateSubmit) {
        log.info("定义手机端防重复提交切点");
    }

    @Around("preventAppDuplicateSubmitPointCut(preventAppDuplicateSubmit)")
    public Object doAround(ProceedingJoinPoint pjp, AppPreventDuplicateSubmit preventAppDuplicateSubmit) throws Throwable {
        String resubmitLockKey = generateResubmitLockKey();
        if (resubmitLockKey != null) {
            int expire = preventAppDuplicateSubmit.expire(); // 防重提交锁过期时间
            RLock lock = redissonClient.getLock(resubmitLockKey);
            boolean lockResult = lock.tryLock(0, expire, TimeUnit.SECONDS); // 获取锁失败，直接返回 false
            if (!lockResult) {
                throw new AppBusinessException(ResultCode.REPEAT_SUBMIT_ERROR); // 抛出重复提交提示信息
            }
        } else {
            throw new AppBusinessException(ResultCode.PARAM_ERROR); // 用户请求参数错误
        }
        return pjp.proceed();
    }


    /**
     * 获取重复提交锁的 key
     */
    private String generateResubmitLockKey() {
        String resubmitLockKey = null;
        HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
        String appId = RequestUtils.resolveAppToken(request);
        if (StrUtil.isNotBlank(appId)) {
            resubmitLockKey = RESUBMIT_APP_LOCK_PREFIX + appId + ":" + request.getMethod() + "-" + request.getRequestURI();
            return resubmitLockKey;
        }
        return null;
    }

}
